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Mar Pollut Bull

Title:		Polycyclic aromatic hydrocarbons alter the structure of oceanic and oligotrophic microbial food webs
Author(s):		Cerezo MI; Agusti S;
Address:		"Department of Global Change Research, IMEDEA (CSIC-UIB), Instituto Mediterraneo de Estudios Avanzados, Miquel Marques 21, 07190 Esporles, Spain. Electronic address: mcerezo@imedea.uib-csic.es. Department of Global Change Research, IMEDEA (CSIC-UIB), Instituto Mediterraneo de Estudios Avanzados, Miquel Marques 21, 07190 Esporles, Spain; Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. Electronic address: susana.agusti@kaust.edu.sa"
Journal Title:		Mar Pollut Bull
Year:		2015
Volume:		20151106
Issue:		2
Page Number:		726 - 735
DOI:		10.1016/j.marpolbul.2015.10.004
ISSN/ISBN:		1879-3363 (Electronic) 0025-326X (Linking)
Abstract:		"One way organic pollutants reach remote oceanic regions is by atmospheric transport. During the Malaspina-2010 expedition, across the Atlantic, Indian, and Pacific Oceans, we analyzed the polycyclic aromatic hydrocarbon (PAH) effects on oceanic microbial food webs. We performed perturbation experiments adding PAHs to classic dilution experiments. The phytoplankton growth rates were reduced by more than 5 times, being Prochlorococcus spp. the most affected. 62% of the experiments showed a reduction in the grazing rates due to the presence of PAHs. For the remaining experiments, grazing usually increased likely due to cascading effects. We identified changes in the slope of the relation between the growth rate and the dilution fraction induced by the pollutants, moving from no grazing to V-shape, or to negative slope, indicative of grazing increase by cascade effects and alterations of the grazers' activity structure. Our perturbation experiments indicate that PAHs could influence the structure oceanic food-webs structure"
Keywords:		"Atlantic Ocean *Food Chain Herbivory Indian Ocean Pacific Ocean Phytoplankton/drug effects/*growth & development Polycyclic Aromatic Hydrocarbons/*analysis/toxicity Prochlorococcus/drug effects *Water Microbiology Water Pollutants, Chemical/*analysis/toxi;"
Notes:		"MedlineCerezo, Maria Isabel Agusti, Susana eng Research Support, Non-U.S. Gov't England 2015/11/12 Mar Pollut Bull. 2015 Dec 30; 101(2):726-35. doi: 10.1016/j.marpolbul.2015.10.004. Epub 2015 Nov 6"